Steam-boiler.



PATENTED SEPT. 13, 1904. H. SCHOFIELD & S. J. ROSS.

STEAM BOILBP..

APPLICATION FILED DEO.11, 1903.

2 SHEETS-SHEET l.

N0 MODEL.

-Y Zvi/@1550.715

f1 Imi" No. 770,247. PATENTED SEPT. 13, 1904. H. SCHOFIELD 6L S. J. ROSS.

STEAM BOILER.

APPLICATION FILED DB0.11,'1903.

No MODEL, 2 SHEETS-SHEET 2.

Sgm hwg' d 179'@ UNITED STATES Patented September 13, 1904.

PATENT EEicE.

HARRY SCHOFIELD AND SIDNEY lJOHN ROSS, OF LONDON, ENGLAND, AS-

SIGNORS OF FIVE-NINTHS TO FELIX DENNIS,

OF HAVRE, FRANCE, AND

OLIVER PRESCOTT MACFARLANE, OF THUNDRIDGE, WARE, COUNTY OF HERTS, ENGLAND.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 770,247, dated September 13, 1904. Application iiled December 11, 1903. Serial No. 184,826. (No model.)

To all whom it may concer-n:

Beit known that we, HARRY ScHoFrELD, engineer, residing at l Bryantwood road, Drayton Park, and SIDNEY JOHN Ross, marine engineer, residing at 37 Lower Clapton road, London, England, both subjects of the King of Great Britain, have invented certain new and useful Improvements in land Relating to Means for Promoting Circulation in Steam- Boilers, of which the following is a specification.

This invention has reference to means for promoting circulation in steam-boilers of the ordinaryor cylindrical type,sometimes termed shell-boilers, and is applicable more particularly to what are known as marine77 boilers.

i The main object of the invention is to provide means for setting up a longitudinal circulation in the boiler, so that the water may flow, say, from the front thereof under the furnace-fines and then return along the top of the said flues, thus bringing' the water, which has a tendency to remain dead or idle under the lines, into active circulation and also insuring the proper covering of the furnacecrowns. Such an arrangement, it will be seen, is distinguished from the ordinary circulating devices at present in use, as these latter throw the water, up above the ordinary level thereof,and thereby often produce Wet steam or priming without ever getting the whole mass of water into proper circulation.

The invention further has reference to certain details of construction, such as an improved junction-box with internally-arranged caps, as hereinafter described.

In carrying out the invention suitable upwardly-directed water-tubes are arranged behind the rear opening of the ues and in the path of the furnace-gases, these tubes having suitable connections through the boiler-shell with the water-spaces above and below the iues, so that the heating of the water inside said tubes avill set up the desired circulation. In combination with these tubes, but inside the boiler, suitable directing plates or pipes are arranged, which will assist the action by causing the water to be drawn from any desired point in the boiler and to be discharged in a forward direction, say, over or toward the front and hottest part of the flues.

The invention will be more readily underderstood by reference to the accompanying drawings, in which# Figure l is a rear end view of a two-fine boiler provided with the improved circulators. Fig. 2 is a central section through the circulators, to a larger scale, taken on the line .fr Fig. 1; and Fig. 3 is a still further enlarged detail section on the liney y, Fig. 2,

showing the construction of junction boX above referred to.

In the arrangement shown, o is an ordinary boiler of the Scotch or shell type having two flues b, at the rear end of which are the inclined water-circulating tubes c, of which there may be any number of sets. These tubes are connected to inclined drums t at opposite sides of the boiler, and the corresponding tubes on either side extend upward toward a common junction-box e, (see also Fig. 3,) the arrangement being such that they pass transversely across the ends or openings of their respective iiues b. The drums d and junction-boxes e are connected with the waterspace of the boiler by suitable short tubes or junction-nipples f, and of the latter those belonging to the upper boxes are inclined, as shown, so that an easy path is provided for the water coming up the circulation-tubes c, and sharp bends which would be liable to cause surging or foaming are avoided. In order to allow of these inclined nipples being properly connected with the boiler, the latter is provided with a special plate g, having stamped or otherwise formed therein suitable inclined swellings or projections L, the lower faces of which are at right angles to the said nipple-tubes, and thus serve to receive the latter (see Fig. 2) in the ordinary way and afford an efective junction. The corresponding faces z of the junction-boxes may also bc similarly inclined to accommodate the other ends of the junction-tubes. j represents the directing-pipes, which are suitably arranged inside the boiler to cond uct or guide the water to and from these nipples or'junction-tubes, and these pipes may be of different lengths and lead to any desired parts of the boiler. For instance, the lower ones may be led into the middle of the bottom space below the fiues, if desired. (See dotted lines, Fig. l.) These pipes may be fixed in position by means of lugs 7c thereon bolted to some convenient part of the boiler or by other suitable supports.

Suitable holes Z are provided in the junction-boxes opposite the ends of the circulation-tubes c and are closed from the inside by caps m, so that the pressure inside tends to keep them on their seats. In order to permit of the insertion of these caps, the short tubes f are made of such a diameter that the said caps can be passed down through them into the junction-box. rlhe caps m are simply held in place by a nut-and-bridge arrangement outside, comprising a bridge or cross piece n, through which passes a bolt 0, fixed to the cap and engaged by the nut p. The latter is made in the form of a cap-nut, as shown, so that it covers and protects the screwthread on the bolt from the effect of the furnace-gases. It will be seen that in this way bthere is no strain set up on the nut or on the bridge-piece by the pressure which acts on the cap. The side drums may, if desired, be provided with similar caps opposite the junction-nipples and may for convenience be connected to a blow-ofi1 arrangement q common to both.

The action is as follows: The water in the tubes c is heated by the gases from the flues and is caused to circulate in an upward direction, being drawn into these tubes through the lower tubes f and discharged at the top through the upper directing-pipes j, as indicated by the arrows, thus' setting up the desired circulation from one end to the other and back again inside the boiler.

Obviously various other arrangements of the elements above described may be made, according to the special type of boiler to which they are being applied, without departing from the nature of the invention.

What we claim, and desire to secure by Letters Patent ofthe United States, is

1. A steam-boiler provided with upflow circulation-tubes behind the lines and in the path of the furnace-gases, said tubes leading directly upward fromthe bottom of the boiler to the upper part thereof, and drawing water in rearwardly at the bottom and discharging it forwardly at the top into the water-space, thus 'setting' up a longitudinal circulation, substantially as described.

2. A steam-boiler provided with upowtubes behind the flues leading directly upward from the space at the bottom into the space at the top of said flues, means enabling said tubes to draw in water rearwardly at the bot- Y discharging water onto the top of the flue longitudinally from said upflow-tube, substantially as described.

4. The combination in an internally-fired boiler of a Hue, a circulation-tube arranged across the rear end of said liuc, and connections between the upper and lower ends of said tube and the water-space below the waterlevel, said connections being arranged in the path of circulation of the water in the boiler,

so that the water can enter and leave them without changing its course, substantially as described.

5. A steam-boiler provided with circulationtubes of large diameter behind the flues and in the path of the furnace-gases, with means for connecting said pipes with the water-space above and below the flues, and with means for drawing in and discharging the circulating water in a longitudinal direction, substantially as described.

6. A steam-boiler provided with circulationtubes of large diameter on which the fire-gases impinge, means for drawing water from the boiler into the bottom of said pipes in a backward longitudinal direction, and means for discharging water from the top of said pipes into the boiler into the water-space also in a forward longitudinal direction, substantially as described.

7. An internally-fired steam-boiler provided with circulation-tubes of large diameter behind and external to its iiues in the path of the gases, means for connecting said tubes with the water-space near the top and bottom of the flues and with means for conducting water in a longitudinal direction to and from said tubes and from and to the boiler below the water-level in the latter, for circulating the boiler-water in a to-and-fro circuit, substantially as described.

8. The combination with an internally-fired boiler, of circulation-tubes of large diameter behind and external to the flue and means for connecting said tubes'with the water-space at points below and above the furnace-flue, and for discharging the water from the upper ends of said tubes in a forward horizontal direction'toward the front of the furnace, substantially as described.

9. The combination with an internally-fired boiler, of circulation-tubes of large diameter behind the lues, connections for said tubes IOO IIO

ISO

leading into the water-space below and above the lues, and means for directing the flow of water on a longitudinal direction forward above the liues and backward below the ilues, substantially as described.

l0. In a circulating apparatus for a steamboiler, the arrangement of the inclined circulation-tubes leading from inclined drums on opposite sides of the boiler and meeting in common junction-boxes at their'upper ends, said drums and junction-boxes being connected by suitable nipples with the water-space in the boiler, substantially as described.

11. In a steam-generator, the combination of circulation-tubes, connections at the lower ends of said tubes leading into the water-space below the lues, junction-boxes at the upper ends of said lues, and inclined tubular nipples leading into the water-space above the flues, substantially as described.

12. In a steam-generator, the combination of circulation-tubes connected at their lower ends with the water-space in the bottom of the boiler, junction-boxes at the top ends of said tubes, internally-fixed caps inside said junction-boxes, and tubular nipples leading from the junction-boxes into the water-space, and made large enough to admit of said internal caps being passed down them to admit oi' easy itting from the inside, substantially as described.

HARRY SCHOFIELD. SIDNEY JOHN ROSS.

Witnesses:

E. A. REA, H. D. JAMESON. 

